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			<h1>Python <span class="color_h1">for 循环语句</span></h1>
<p>Python for循环可以遍历任何序列的项目，如一个列表或者一个字符串。</p>
<p><strong>语法：</strong></p>
<p>for循环的语法格式如下：</p>
<pre>
for iterating_var in sequence:
   statements(s)
</pre>   

<p><strong>流程图：</strong></p>
<p><img decoding="async" src="https://www.runoob.com/wp-content/uploads/2013/11/A71EC47E-BC53-4923-8F88-B027937EE2FF.jpg"  /></p>
<p><strong>实例：</strong></p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python</span><span class="hl-code">
</span><span class="hl-comment"># -*- coding: UTF-8 -*-</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">letter</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-quotes">'</span><span class="hl-string">Python</span><span class="hl-quotes">'</span><span class="hl-code">:     </span><span class="hl-comment"># 第一个实例</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-brackets">(</span><span class="hl-quotes">&quot;</span><span class="hl-string">当前字母: %s</span><span class="hl-quotes">&quot;</span><span class="hl-code"> % </span><span class="hl-identifier">letter</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">fruits</span><span class="hl-code"> = </span><span class="hl-brackets">[</span><span class="hl-quotes">'</span><span class="hl-string">banana</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">apple</span><span class="hl-quotes">'</span><span class="hl-code">,  </span><span class="hl-quotes">'</span><span class="hl-string">mango</span><span class="hl-quotes">'</span><span class="hl-brackets">]</span><span class="hl-code">
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">fruit</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-identifier">fruits</span><span class="hl-code">:        </span><span class="hl-comment"># 第二个实例</span><span class="hl-code">
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前水果: %s</span><span class="hl-quotes">'</span><span class="hl-code">% </span><span class="hl-identifier">fruit</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">&quot;</span><span class="hl-string">Good bye!</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">)</span></div>
</div>
<br>
<a target="_blank" href="../try/runcode.php?filename=for_demo1&type=python" class="tryitbtn" rel="noopener noreferrer">尝试一下 »</a>

</div>
<p>以上实例输出结果:</p>
<pre>
当前字母: P
当前字母: y
当前字母: t
当前字母: h
当前字母: o
当前字母: n
当前水果: banana
当前水果: apple
当前水果: mango
Good bye!
</pre>
<br><hr>
<h2>通过序列索引迭代</h2>
<p>另外一种执行循环的遍历方式是通过索引，如下实例：</p>
<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python</span><span class="hl-code">
</span><span class="hl-comment"># -*- coding: UTF-8 -*-</span><span class="hl-code">
 
</span><span class="hl-identifier">fruits</span><span class="hl-code"> = </span><span class="hl-brackets">[</span><span class="hl-quotes">'</span><span class="hl-string">banana</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-quotes">'</span><span class="hl-string">apple</span><span class="hl-quotes">'</span><span class="hl-code">,  </span><span class="hl-quotes">'</span><span class="hl-string">mango</span><span class="hl-quotes">'</span><span class="hl-brackets">]</span><span class="hl-code">
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">index</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-builtin">len</span><span class="hl-brackets">(</span><span class="hl-identifier">fruits</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">:
   </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">当前水果 : %s</span><span class="hl-quotes">'</span><span class="hl-code"> % </span><span class="hl-identifier">fruits</span><span class="hl-brackets">[</span><span class="hl-identifier">index</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-code">
 
</span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">&quot;</span><span class="hl-string">Good bye!</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">)</span></div>
</div>
</div>
<p>以上实例输出结果：</p>
<pre>
当前水果 : banana
当前水果 : apple
当前水果 : mango
Good bye!
</pre>
<p>以上实例我们使用了内置函数 len() 和 range(),函数 len() 返回列表的长度，即元素的个数。
range返回一个序列的数。</p>
<br><hr>
<h2>循环使用 else 语句</h2>
<p>在 python 中，for … else 表示这样的意思，for 中的语句和普通的没有区别，else 中的语句会在循环正常执行完（即 for 不是通过 break 跳出而中断的）的情况下执行，while … else 也是一样。</p>

<div class="example">
<h2 class="example">实例</h2>
<div class="example_code">
<div class="hl-main"><span class="hl-comment">#!/usr/bin/python</span><span class="hl-code">
</span><span class="hl-comment"># -*- coding: UTF-8 -*-</span><span class="hl-code">
 
</span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">num</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">10</span><span class="hl-code">,</span><span class="hl-number">20</span><span class="hl-brackets">)</span><span class="hl-code">:  </span><span class="hl-comment"># 迭代 10 到 20 之间的数字</span><span class="hl-code">
   </span><span class="hl-reserved">for</span><span class="hl-code"> </span><span class="hl-identifier">i</span><span class="hl-code"> </span><span class="hl-reserved">in</span><span class="hl-code"> </span><span class="hl-builtin">range</span><span class="hl-brackets">(</span><span class="hl-number">2</span><span class="hl-code">,</span><span class="hl-identifier">num</span><span class="hl-brackets">)</span><span class="hl-code">: </span><span class="hl-comment"># 根据因子迭代</span><span class="hl-code">
      </span><span class="hl-reserved">if</span><span class="hl-code"> </span><span class="hl-identifier">num</span><span class="hl-code">%</span><span class="hl-identifier">i</span><span class="hl-code"> == </span><span class="hl-number">0</span><span class="hl-code">:      </span><span class="hl-comment"># 确定第一个因子</span><span class="hl-code">
         </span><span class="hl-identifier">j</span><span class="hl-code">=</span><span class="hl-identifier">num</span><span class="hl-code">/</span><span class="hl-identifier">i</span><span class="hl-code">          </span><span class="hl-comment"># 计算第二个因子</span><span class="hl-code">
         </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">%d 等于 %d * %d</span><span class="hl-quotes">'</span><span class="hl-code"> % </span><span class="hl-brackets">(</span><span class="hl-identifier">num</span><span class="hl-code">,</span><span class="hl-identifier">i</span><span class="hl-code">,</span><span class="hl-identifier">j</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">
         </span><span class="hl-reserved">break</span><span class="hl-code">            </span><span class="hl-comment"># 跳出当前循环</span><span class="hl-code">
   </span><span class="hl-reserved">else</span><span class="hl-code">:                  </span><span class="hl-comment"># 循环的 else 部分</span><span class="hl-code">
      </span><span class="hl-identifier">print</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">%d 是一个质数</span><span class="hl-quotes">'</span><span class="hl-code"> % </span><span class="hl-identifier">num</span><span class="hl-brackets">)</span></div>
</div>
<br>
<a target="_blank" href="../try/runcode.php?filename=for_demo2&type=python" class="tryitbtn" rel="noopener noreferrer">尝试一下 »</a>
</div>
<p>以上实例输出结果：</p>
<pre>
10 等于 2 * 5
11 是一个质数
12 等于 2 * 6
13 是一个质数
14 等于 2 * 7
15 等于 3 * 5
16 等于 2 * 8
17 是一个质数
18 等于 2 * 9
19 是一个质数
</pre>
<p>更多实例：<a href="../w3cnote/prints-diamonds-triangles-rectangles.html" target="_blank" rel="noopener noreferrer">python 打印菱形、三角形、矩形</a></p>			<!-- 其他扩展 -->
						
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<div id="postcomments"  style="display:none;" >
	<ol class="commentlist">
		<li class="comment byuser comment-author-tianqixin bypostauthor even thread-even depth-1" id="comment-1049"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;缘分天注定</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;738***641@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="http://www.runoob.com">&nbsp;&nbsp;参考地址</a></p></div><div id="runoobvote-id-1049" data-commid = "1049" class="upvotejs"><a class="upvote"></a> <span class="count">96</span></div></div><div class="comt-main" id="div-comment-1049"><p>使用内置 enumerate 函数进行遍历:</p>
<pre>
for index, item in enumerate(sequence):
    process(index, item)
</pre>
<h2>实例</h2>
<pre>
&gt;&gt;&gt; sequence = [12, 34, 34, 23, 45, 76, 89]
&gt;&gt;&gt; for i, j in enumerate(sequence):
...     print i,j
... 
0 12
1 34
2 34
3 23
4 45
5 76
6 89
</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">缘分天注定</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;缘分天注定</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;738***641@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="http://www.runoob.com">&nbsp;&nbsp;参考地址</a></p></div></span>6年前 (2017-02-27)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-11190"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;shenwenwin</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;she***nwin@163.com</p></div><div id="runoobvote-id-11190" data-commid = "11190" class="upvotejs"><a class="upvote"></a> <span class="count">35</span></div></div><div class="comt-main" id="div-comment-11190"><h2>for 使用案例</h2>
<p>使用list.append()模块对质数进行输出。
</p>
<pre>
#!/usr/bin/python
# -*- coding: UTF-8 -*-

# 输出 2 到 100 简的质数
prime = []
for num in range(2,100):  # 迭代 2 到 100 之间的数字
   for i in range(2,num): # 根据因子迭代
      if num%i == 0:      # 确定第一个因子
         break            # 跳出当前循环
   else:                  # 循环的 else 部分
      prime.append(num)
print prime
</pre>
<p>输出结果：</p>
<pre>[2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">shenwenwin</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;shenwenwin</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;she***nwin@163.com</p></div></span>6年前 (2017-04-19)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-11671"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;kimiYang</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;943***010@qq.com</p></div><div id="runoobvote-id-11671" data-commid = "11671" class="upvotejs"><a class="upvote"></a> <span class="count">21</span></div></div><div class="comt-main" id="div-comment-11671"><p>打印空心等边三角形:</p>
<pre>
#!/usr/bin/python
# -*- coding: UTF-8 -*-

# 打印空心等边三角形 
rows = int(raw_input('输入行数：'))
for i in range(0, rows):
    for k in range(0, 2 * rows - 1):
        if (i != rows - 1) and (k == rows - i - 1 or k == rows + i - 1):
            print " * ",
        elif i == rows - 1:
            if k % 2 == 0:
                print " * ",
            else:
                print "   ",
        else:
            print "   ",
    print "\n"
</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">kimiYang</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;kimiYang</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;943***010@qq.com</p></div></span>6年前 (2017-05-05)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-12766"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;feng</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;124***7699@qq.com</p></div><div id="runoobvote-id-12766" data-commid = "12766" class="upvotejs"><a class="upvote"></a> <span class="count">12</span></div></div><div class="comt-main" id="div-comment-12766"><p>打印1-9三角形阵列:</p><pre>
#!/usr/bin/python
# -*- coding: UTF-8 -*-

for i in range(1,11):
    for k in range(1,i):
        print k,
    print "\n"
</pre><p>输出结果：</p>
<pre>
1 

1 2 

1 2 3 

1 2 3 4 

1 2 3 4 5 

1 2 3 4 5 6 

1 2 3 4 5 6 7 

1 2 3 4 5 6 7 8 

1 2 3 4 5 6 7 8 9 
</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">feng</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;feng</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;124***7699@qq.com</p></div></span>6年前 (2017-06-08)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-13370"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;ljm</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;131***1561@qq.com</p></div><div id="runoobvote-id-13370" data-commid = "13370" class="upvotejs"><a class="upvote"></a> <span class="count">16</span></div></div><div class="comt-main" id="div-comment-13370"><pre>#!/usr/bin/python
# -*- coding: UTF-8 -*-

'''在python中，for循环后的in跟随一个序列的话，循环每次使用的序列元素，而不是序列
的下标'''
s = 'qazxswedcvfr'
for i in range(0,len(s),2):
    print s[i]
'''enumerate() :
    在每次循环中，可以同时得到下标和元素
    际上，enumerate(),在每次循环中返回的是包含每个元素的定值表，两个元素分别赋值
 index，char'''
for (index,char) in enumerate(s):
    print "index=%s ,char=%s" % (index,char)</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">ljm</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;ljm</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;131***1561@qq.com</p></div></span>6年前 (2017-06-27)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-15728"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;为梦而来</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;183***85363@163.com</p></div><div id="runoobvote-id-15728" data-commid = "15728" class="upvotejs"><a class="upvote"></a> <span class="count">14</span></div></div><div class="comt-main" id="div-comment-15728"><p>冒泡排序,来至于高学军:</p><pre>#!/usr/bin/python
# -*- coding: UTF-8 -*-

# 冒泡排序# 定义列表 list
arays = [1,8,2,6,3,9,4]
for i in range(len(arays)):
    for j in range(i+1):
        if arays[i] &lt; arays[j]:
            # 实现连个变量的互换
            arays[i],arays[j] = arays[j],arays[i]
print arays</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">为梦而来</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;为梦而来</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;183***85363@163.com</p></div></span>6年前 (2017-08-02)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-17440"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;forMyPeople</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;lwy***68957@126.com</p></div><div id="runoobvote-id-17440" data-commid = "17440" class="upvotejs"><a class="upvote"></a> <span class="count">16</span></div></div><div class="comt-main" id="div-comment-17440"><p>更多实例：<a href="../w3cnote/prints-diamonds-triangles-rectangles.html" rel="nofollow">python 打印菱形、三角形、矩形</a>的代码感觉，写的有点复杂了，如果让你画圆或者其他图形呢？</p>

<p>其实运用数学公式，就可以了。比如菱形 <span class="marked">|x - w/2| + |y - w/2| = w/2</span> 轻松搞定。</p>

<pre>#!/usr/bin/python
# -*- coding: UTF-8 -*-

width = int(raw_input('输入对角线长度： '))
for row in range(width + 1):
    for col in range(width + 1):
        if ((abs(row - width/2) + abs(col - width/2)) == width/2):
            print "*",
        else:
            print " ",
    print " "</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">forMyPeople</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;forMyPeople</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;lwy***68957@126.com</p></div></span>6年前 (2017-09-12)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-28834"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;冷火</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;jes***appy@163.com</p></div><div id="runoobvote-id-28834" data-commid = "28834" class="upvotejs"><a class="upvote"></a> <span class="count">17</span></div></div><div class="comt-main" id="div-comment-28834"><p>Python for 常用实例说明：</p>
<pre>#!/usr/bin/python
# -*- coding: UTF-8 -*-

print "for循环只能执行range内两数字相减次数"
for i in range(1,10):     # 只能执行9次,判断循环终止条件是 &gt;= 第二个数字 10 就不再执行 和 其他语言的 i=1 to 10 不同
    print 'i=:', i

print "使用xrange还是一样的效果"
for i in xrange(1,10,1):     #还是只能执行9次,和其他语言的 i=1 to 10 可执行10次是不同的
    print 'i=:', i    
    
print 'for i in range(1,1)这样是不会进入循环的'
print "而其他语言的 for i=1 to 1 是可以进入一次循环的"
for i in range(1,1):     # 也就是说这样是不会进入循环的。
    print '没执行这里：i=:', i
print "所以，要执行定次数循环必须将range(1,1)的第二个数字加1"

print "for实现step效果递增"
for i in xrange(0,10,2):
    print(i)

print "for实现step效果递减"
for i in xrange(10,0,-2):
    print(i)
</pre>
<p>输出结果为：</p>
<pre>
for循环只能执行range内两数字相减次数
i=: 1
i=: 2
i=: 3
i=: 4
i=: 5
i=: 6
i=: 7
i=: 8
i=: 9
使用xrange还是一样的效果
i=: 1
i=: 2
i=: 3
i=: 4
i=: 5
i=: 6
i=: 7
i=: 8
i=: 9
for i in range(1,1)这样是不会进入循环的
而其他语言的 for i=1 to 1 是可以进入一次循环的
所以，要执行定次数循环必须将range(1,1)的第二个数字加1
for实现step效果递增
0
2
4
6
8
for实现step效果递减
10
8
6
4
2
</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">冷火</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;冷火</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;jes***appy@163.com</p></div></span>5年前 (2018-06-27)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-38421"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;公子留仙</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;187***99165@139.com</p></div><div id="runoobvote-id-38421" data-commid = "38421" class="upvotejs"><a class="upvote"></a> <span class="count">10</span></div></div><div class="comt-main" id="div-comment-38421"><p>输出各种形状三角形：</p>
<pre>#coding=UTF-8
rows = int(input('输入列数： '))
print "用for函数书写的正等腰直角三角形"
for i in range(0, rows):
    for k in range(0, i+1):
        print " * ",
    print "\n"
print "用for函数书写的倒等腰直角三角形"
for i in range(0, rows):
    for k in range(0, rows-i):
        print " * ",
    print "\n"
print "用while函数书写的正等腰直角三角形"
i=1
while i:
    j=1
    while j:
        print "*"," ",
        if i==j:
            break
        j+=1
        if j&gt;rows:
           break
    print "\n"
    i+=1
    if i&gt;rows:
        break</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">公子留仙</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;公子留仙</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;187***99165@139.com</p></div></span>4年前 (2018-12-27)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-60795"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;SUNBIRDS</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;292***34@QQ.COM</p></div><div id="runoobvote-id-60795" data-commid = "60795" class="upvotejs"><a class="upvote"></a> <span class="count">12</span></div></div><div class="comt-main" id="div-comment-60795"><p>输入区间，求取区间内的质数，看着大家都在做笔记，我也留一个吧。</p>

<pre>a = []
#需要输入2个整数，用来确定求质数的范围
start =int( input("请输入你想要的求取质数范围开始值:"))
end1 = int(input("请输入你想要的求取质数范围结束值:"))
for num in range(start,end1):
    j = 0
    for i in range(2,num):
        if num % i == 0:
            print("%d = %d * %d" % (num,num/i,i))
            
            break
            #pass
    else:
        print(num,"是一个质数")
        a.append(num)
    
print("--------已经都存起来了----------")  
print(a)  </pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">SUNBIRDS</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;SUNBIRDS</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;292***34@QQ.COM</p></div></span>2年前 (2021-01-18)</div></div></li><!-- #comment-## -->
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